Numerical simulation of air and particle motions in group-B particle turbulent fluidized bed

Air and particle motions in a group-B particle turbulent fluidized bed are numerically simulated. The locally averaged three-dimensional Navier-Stokes equations and the Lagrangian particle equations, in which the mutual inter actions between air and particles and the two-body collisions between parti cles were taken into account. were simultaneously solved. Reynolds stress t erms and the turbulent mass flux terms caused by the subgrid scale fluctuat ions have been modeled by the large eddy simulation in which the effect of particle existence on subgrid scale flows has been taken into account. The corresponding experiments were also performed. It is found that calculated results well represent the experimental instantaneous particle positions an d flow characteristics of the air and particles, and enable us to know the mechanisms of various phenomena such as the large complex bubbling flow and the particle cluster formation. (C) 2001 Elsevier Science B.V. All rights reserved.